A comparison of three methods of direct measurement of high concentrations of atmospheric radon.

Three methods of direct measurement of radon in the case of highly radioactive atmospheres were studied and compared. The first one used the CEA-STEPPA scintillating bottles as standards. In the second technique, the “double filter” system, a known air flow rate was drawn through a decay chamber. In the last technique, the radon radioactive deposit was trapped electrostatically by means of a negative direct-current high voltage. All the three methods were operated in a uranium mine and gave similar results. Their respective advantages and sensitivities were tested.

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